mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Hardness: 6-6
Color: Pale brass-yellow
Luster: Metallic

Identified July 12, 2026More mineral →

Explore Pyrite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Forms in diverse environments including hydrothermal veins, sedimentary rocks through metabolic activity of bacteria, and as an accessory mineral in igneous rocks.

Uses & applications

Historical source of sulfur and sulfuric acid; used in jewelry as 'marcasite'; utilized in lithium batteries and as a semiconductor material.

Geological facts

Nickname 'Fool's Gold' because its color resembles gold, though it is much harder and more brittle. It can create sparks when struck against steel.

Field identification & locations

Identify by its cubic crystal habit, brassy color, and greenish-black streak. Common in mining districts of Peru, Spain, and the United States (Utah, Colorado).